Muffler



Patented Aeg. 3, 193i.

l uNiTigzDr STATES PATENToFFicI-y 2,088,576 MUFIER obert W. Compo, Deiancepohio Application July 24, 1936, Serial No. ,92,306

'-2 Claims.

dissipated by counterpneumatic shock-absorbing` pressures automatically created by Athe pressures of the exhaust.

The invention consists in providing a muiiler for internal combustion engines having one Yor more cones disposed in series or tandem arrange-,- ment, interconnected only through the apices of the cones and communicating with surroundingv closed chambers through restricted openings in l5 the walls of the cones to produce automatically rising pressures of the trapped air in each of the chambers which is counter to the pressures of the exhaust gases and thereby progressively absorbing the explosive pressure of the pulsating exf g'haust gases and cause the`delivery of the gases at a substantially constant stream flow.

' The invention may be contained in muiiiers that vary in their details and to illustrate a practical application of the invention, I have selected a muiiler containing the invention as an example of the various structures in which the invention .may be embodied. The particular muiiier referred to is shown in the accompanying drawing and is described hereinafter.

Fig. lis a longitudinal section of the mufer A particularly referred to., Fig. 2 is an enlarged Nvsection of one end part of the muiiler wherein the details ofthe-structure are lmore clearly illustrated than in Fig. 1. Fig. 3 is a view of a section g5 taken on the plane of the line 3-3 indicated in Fig. 2.

In the muiller -I shown in the drawing, a plurality of axially aligned cones 2, 3, and 4 are located in a shell 6 and connected in' tandem whereby the smaller end of each cone is connected to or communicates with the larger end of the succeeding cone. The shell 6 is provided with the ends or heads 'I and 8. The head I has an inlet port 9 to which the exhaust pipe of the engine may be connected, and the head 8 has an outlet port II to which themtail pipe is connected for delivery of the exhaust products fromthe muiller. y

, The shell is divided into the chambers I2, I3,

Il, and I5 by the circular plates I6 and I1 and I8 having iianged parts that fit the interior surfaces f the shell and ilanged parts that t the .open apices of the cones. The plates are formed solid, that is, without openings, and,V except for the connection through the apices ofthe cones,

(ci. isi-,41)

formclosed chamber parts exterior to the walls of the cones. The cones are located in the chambers I2, I3, and I4, respectively, and the-gases are delivered from the last cone of the series into the chamber I5 whence the gases are discharged throughfthe port II andthe tall pipe. The larger ends of the cones iit the inner surfaces of the shells, and the apices nt the flanged openings I9 formed in the central parts of the plates I6, I1, and I8. The cones are without heads and therefore the exhaust gases as they enter the chambers in which the cones are located, freely expand and` u by their pressure are forced vinto the cones in succession.

The sides of the cones are provided with a plurality of small openings.' Preferably slotted openings 22 are formed in the walls of the cones and are located in the planes of the axes of the cones. In the forming of the slotted openings 22, edge parts of the slots are pressed outward to form louvers. The edges of the slots are in the planes of the axes of the cones, and so as'to direct the gases from the cones into the chamber parts exterior to the cones in directions extending tangential to the surface of the cones. The openings of the louvers may be arranged in rows and the openings of the alternate rows may be such.

as to direct the gas streams in directions that are counter to each other with respect to the circle 0f the cones in which the openings may be located to produce counter-pressure by the influx of exhaust gases into the chamber parts exterior to the cones and thus prevent rotative whirling movement of the gases as they' enter the chamber parts and as they are returned to the interior of the cones.

Upon entrance of the exhaust gases into each cone, through the restricted inlets, expansion within the larger end of the cone immediately occurs. Also the exhaust gases are forced through the wall openings of each cone counter to the pressure of the air within the chamber part exterior to the cone whichA is trapped therein, l and the peak of the pulsating pressure is progressively leveled as the pulsation moves toward thel delivery end of the muiIler.

* The trappedairinthe chamber to the cones thusi yieldingly-counteracts the pulsatingexhaust pressure and operates to return exhaust gases to within thecone as the presure i of the exhaust gases reduces and while the cone is exhausting into the succeeding cone and chambex` where the gas again expands but with a greatly reduced pressure. The velocity ow is greatly decreased as the pulsations of the exhaust genes' parts exterior.'v

gases enter the chamber` I5 whence they are discharged at a substantially constant rate of stream flow.

I claim:

1. In a muiiler, a shell, the ends of the shell having inlet and outlet ports and a plurality of partitioning plates forming chambers, cones located in axial alignment and in certain of the chambers. the larger ends of the cones fitting the side wall of the shell and the smaller ends of the cones opening into the larger ends of the next succeeding cones, the inlet port openinginto the interior oi' the endy of the first cone, the side walls of the cones having slitted openings arranged in rows and located in the planes of the axes of the conesl edge parts of the slitted openings pressed outwardly to form louvered openings to direct gas from alternate rows of openings into the chamber parts exterior to the cones in substantially opposite directions and raising the pressure ot the trapped air in the chamber parts by the pressure of the exhaust gases for progressively reducing the intermittlng pulsating presaoaasve progress through the munier until the exhaust sure and producing a substantially constant stream ow through the outlet.

2. In a muiller, a shell, the ends of the shell having inlet and outlet ports, a cone located in the shell, the larger end of the cone fitting the side wall oi' the shell, the inlet port opening into the interior of the larger end part of the cone, the smaller end of the cone communicating with the outlet port, the side wall of the cone having slitted openings arranged in rows and located in the planes of the axis of the cone, the edge parts of the slitted openings pressed outwardly to form louvered openings to direct gas from alternate rows of openings into the chamber part intermediate the exteriorof the cone and the interior wall of the shell in substantially opposite directions and raising the pressure of the trapped air in the said chamber part by the pressure of the exhaust gas which returns the exhaust gas to the cone from the said chamber part upon'reduction of the pressure of the exhaust gas and thereby -produces a substantially constant stream flow through the outlet.

ROBERT W. COMPO. 

